/* 全局重置与变量定义 */
:root {
  --primary: #10b981;
  --primary-hover: #059669;
  --primary-light: #ecfdf5;
  --primary-border: #a7f3d0;
  
  --secondary: #3b82f6;
  --secondary-light: #eff6ff;

  --text-main: #1e293b;
  --text-muted: #64748b;
  --text-light: #94a3b8;

  --bg-main: #ffffff;
  --bg-alt: #f8fafc;
  --bg-card: #ffffff;
  --bg-subtle: #f1f5f9;

  --border-color: #e2e8f0;
  --border-focus: #10b981;

  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.07), 0 2px 4px -2px rgb(0 0 0 / 0.05);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.08), 0 4px 6px -4px rgb(0 0 0 / 0.04);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.06);

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;

  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", sans-serif;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-family);
  color: var(--text-main);
  background-color: var(--bg-main);
  line-height: 1.6;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  overflow-x: hidden;
}

/* 布局辅助 */
.container {
  width: 100%;
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  padding: 80px 0;
}

.bg-alt {
  background-color: var(--bg-alt);
}

.text-center {
  text-align: center;
}

.section-header {
  margin-bottom: 50px;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.section-desc {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 650px;
  margin: 0 auto;
}

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  font-size: 1rem;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s ease;
  border: 1px solid transparent;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.875rem;
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 14px 28px;
  font-size: 1.05rem;
}

.btn-primary {
  background: linear-gradient(135deg, #10b981 0%, #059669 100%);
  color: #ffffff;
  box-shadow: 0 4px 14px 0 rgba(16, 185, 129, 0.35);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #059669 0%, #047857 100%);
  box-shadow: 0 6px 20px 0 rgba(16, 185, 129, 0.45);
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: #ffffff;
  color: var(--text-main);
  border-color: var(--border-color);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background-color: var(--bg-subtle);
  border-color: #cbd5e1;
  transform: translateY(-1px);
}

/* 顶部导航 */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  height: 68px;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-main);
}

.brand-logo {
  width: 38px;
  height: 38px;
  border-radius: 9px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}

.brand-name {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: 8px;
}

.brand-badge {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--primary-hover);
  background-color: var(--primary-light);
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.15s ease;
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-links a:hover {
  color: var(--primary);
}

/* Hero 首屏 */
.hero-section {
  padding: 70px 0 60px;
  background: radial-gradient(circle at 50% 0%, rgba(16, 185, 129, 0.1) 0%, transparent 60%);
  border-bottom: 1px solid var(--border-color);
}

.hero-container {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 40px;
  align-items: center;
}

.tag-badge-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.pill {
  font-size: 0.85rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: var(--radius-full);
}

.pill-green {
  background-color: var(--primary-light);
  color: #047857;
  border: 1px solid var(--primary-border);
}

.pill-blue {
  background-color: var(--secondary-light);
  color: #1d4ed8;
  border: 1px solid #bfdbfe;
}

.pill-outline {
  background-color: #ffffff;
  color: var(--text-muted);
  border: 1px solid var(--border-color);
}

.hero-title {
  font-size: 2.6rem;
  line-height: 1.25;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 18px;
}

.gradient-text {
  background: linear-gradient(135deg, #059669 0%, #10b981 50%, #0ea5e9 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  margin-bottom: 18px;
}

.version-tag {
  background-color: rgba(255, 255, 255, 0.25);
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  margin-left: 4px;
}

.download-tip {
  font-size: 0.875rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

.icon-sm {
  width: 16px;
  height: 16px;
  color: var(--primary);
}

/* 卡片预览视觉 */
.hero-preview {
  position: relative;
}

.phone-card {
  background: #ffffff;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-xl);
  padding: 24px;
  position: relative;
  overflow: hidden;
}

.phone-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, #10b981, #06b6d4);
}

.phone-card-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
}

.status-dot {
  width: 10px;
  height: 10px;
  background-color: var(--primary);
  border-radius: 50%;
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
}

.card-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
}

.notification-sample {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-md);
  padding: 16px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-sm);
}

.notif-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.notif-icon {
  width: 20px;
  height: 20px;
  border-radius: 4px;
}

.notif-app-name {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
}

.notif-time {
  font-size: 0.72rem;
  color: var(--text-light);
  margin-left: auto;
}

.notif-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 4px;
}

.notif-body {
  font-size: 0.875rem;
  color: #475569;
  line-height: 1.5;
  margin-bottom: 12px;
}

.notif-body strong {
  color: #ea580c;
}

.notif-action-btn {
  background: #ffffff;
  border: 1px solid #cbd5e1;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  color: #0284c7;
}

.mini-feature-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.mini-feature-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--text-main);
  font-weight: 500;
}

.check-icon {
  color: var(--primary);
  font-weight: 700;
}

/* 核心特性网格 */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: #cbd5e1;
}

.feature-icon-box {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}

.feature-icon-box.green { background: #d1fae5; color: #059669; }
.feature-icon-box.blue { background: #dbeafe; color: #2563eb; }
.feature-icon-box.purple { background: #f3e8ff; color: #9333ea; }
.feature-icon-box.teal { background: #ccfbf1; color: #0d9488; }
.feature-icon-box.orange { background: #ffedd5; color: #ea580c; }
.feature-icon-box.gray { background: #f1f5f9; color: #475569; }

.feature-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}

.feature-text {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* 对比表格 */
.compare-card {
  background: #ffffff;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.table-responsive {
  overflow-x: auto;
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.compare-table th, .compare-table td {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.95rem;
  vertical-align: top;
}

.compare-table th {
  background-color: var(--bg-alt);
  font-weight: 700;
  color: var(--text-main);
}

.compare-table tr:last-child td {
  border-bottom: none;
}

.highlight-col {
  background-color: rgba(236, 253, 245, 0.4);
}

.safe strong {
  color: #059669;
}

.danger strong {
  color: #dc2626;
}

/* 步骤指南 */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.step-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  position: relative;
  box-shadow: var(--shadow-sm);
}

.step-num {
  font-size: 2.5rem;
  font-weight: 900;
  color: rgba(16, 185, 129, 0.2);
  line-height: 1;
  margin-bottom: 12px;
}

.step-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.step-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* FAQ 手风琴 */
.faq-accordion {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: border-color 0.2s ease;
}

.faq-item[open] {
  border-color: var(--primary-border);
}

.faq-question {
  padding: 18px 24px;
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
  list-style: none;
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-icon {
  font-size: 1.4rem;
  color: var(--text-muted);
  transition: transform 0.2s ease;
}

.faq-item[open] .faq-icon {
  transform: rotate(45deg);
  color: var(--primary);
}

.faq-answer {
  padding: 0 24px 20px 24px;
  color: #475569;
  font-size: 0.95rem;
  line-height: 1.7;
}

.faq-answer ol, .faq-answer ul {
  margin-top: 8px;
  padding-left: 20px;
}

.faq-answer li {
  margin-bottom: 6px;
}

/* 页脚 */
.footer {
  background: #0f172a;
  color: #94a3b8;
  padding: 60px 0 30px;
  border-top: 1px solid #1e293b;
}

.footer-container {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 40px;
}

.footer-left {
  max-width: 480px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: #ffffff;
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 14px;
}

.footer-logo {
  width: 32px;
  height: 32px;
  border-radius: 8px;
}

.footer-disclaimer {
  font-size: 0.85rem;
  line-height: 1.6;
  color: #64748b;
}

.footer-right {
  display: flex;
  flex-direction: column;
  gap: 14px;
  align-items: flex-end;
}

.footer-links {
  display: flex;
  gap: 20px;
}

.footer-links a {
  color: #94a3b8;
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.15s;
}

.footer-links a:hover {
  color: #ffffff;
}

.footer-copyright {
  font-size: 0.8rem;
  color: #475569;
}

/* Modal 弹窗 */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(15, 23, 42, 0.65);
  backdrop-filter: blur(4px);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal-card {
  background: #ffffff;
  border-radius: var(--radius-lg);
  max-width: 440px;
  width: 100%;
  box-shadow: var(--shadow-xl);
  overflow: hidden;
  animation: modalFadeIn 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalFadeIn {
  from { opacity: 0; transform: scale(0.94) translateY(10px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-header {
  padding: 18px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
}

.modal-title {
  font-size: 1.1rem;
  font-weight: 700;
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-light);
  line-height: 1;
}

.modal-close:hover {
  color: var(--text-main);
}

.modal-body {
  padding: 28px 24px;
  text-align: center;
}

.modal-icon {
  font-size: 3rem;
  margin-bottom: 14px;
}

.modal-desc {
  font-size: 0.98rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 24px;
}

.modal-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* 响应式适配 */
@media (max-width: 992px) {
  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-actions {
    justify-content: center;
  }
  .tag-badge-group {
    justify-content: center;
  }
  .download-tip {
    justify-content: center;
  }
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .steps-grid {
    grid-template-columns: 1fr;
  }
  .footer-right {
    align-items: flex-start;
  }
}

@media (max-width: 640px) {
  .hero-title {
    font-size: 1.9rem;
  }
  .nav-links {
    display: none;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .hero-actions .btn {
    width: 100%;
  }
  .compare-table th, .compare-table td {
    padding: 12px 14px;
    font-size: 0.85rem;
  }
}